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1995 Fiscal Year Final Research Report Summary

Study on Summer Type Internal Dew Condensation in Wall of Thermal Insulated and Air-Tight House

Research Project

Project/Area Number 06452295
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Architectural environment/equipment
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

WATANABE Toshiyuki  KYUSHU UNIV., FACULTY OF ENGINEERING,PROFESSOR, 工学部, 教授 (60038106)

Co-Investigator(Kenkyū-buntansha) AKASHI Yasunori  KYUSHU UNIV., FACULTY OF ENGINEERING,RESEARCH ASSOC., 工学部, 助手 (60243896)
RYU Yuji  KYUSHU UNIV., FACULTY OF ENGINEERING,ASSOC.PROFESSOR, 工学部, 助教授 (20191695)
Project Period (FY) 1994 – 1995
KeywordsHouse / Thermal Insulated and Air-Tight / Cooling Time during Summer / Internal Dew Condensation / Life-Style / Questionnaire / Experiment / Numerical Simulation
Research Abstract

Recently, thermal insulated and air-tight houses are built in seasonal hot and humid areas of Japan. But a percentage of water content in the house frame or the thermal insulating material increases after the rainy season, so there is probability that an internal dew condensation is induced in the wall in a cooling time during summer season and deteriorates the wall.
A purpose of this study is that a guidance for a design of the wall constitution and a prevention method for the internal dew condensation are suggested about the insulated and air-tight house in seasonal hot and humid area.
Based on a questionnaire for the first year, we measured indoor air temperature-humidity, electrical energy consumption for air-conditioning, the existance of internal dew condensation and its damage of 15 houses, which consisted of 3 conventional detached houses, 4 conventional apartment houses, 4 insulated detached houses and 4 insulated apartment houses in Fukuoka Prefecture. We also measured air-tigh … More tness of 6 detached houses in both Fukuoka and Yamaguchi Prefecture according to building construction and building element. We made some improvements on a calculation model and examined a suitable guideline for the thermal design of walls in seasonal hot-humid area by using these results and numerical simulations. The main results obtained are as follows.
(1) According to the questionnaire, there are more damages in insulated apartment houses.
(2) People living in the insulated houses have less interest in solar shading and cross-ventilation, and have much dependence on air-conditioning.
(3) Air-tightness is the most effective in the outside insulated construction, the second is in the panel construction, the third is the frame construction, the last is the conventional one. Especially, air-tightness indicates a wide scatter in the frame or conventional method by level of construction.
(4) In case of 24 hours air-conditioning, the most suitable thickness of the thermal insulating material (glass wool 10 K) is 24 cm and the most suitable air-tightness is 2.1cm^2/m^2 as an equivalent leakage area per floor area in Sapporo. However, it takes 14 cm and 4 cm^2/m^2 in Fukuoka. In case of intermittent air-conditioning, it takes 3.5 cm and 7.8cm^2/m^2 in Fukuoka.
(5) It needs to keep a vent layr on a back of the exterior finish material and a vapor transmission sheet inside of the vent layr, and does not need to have the vapor transmission sheet on a back of the interior finish material. Less

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 福島逸成,渡辺俊行,他: "福岡市における夏季の住まい方と住宅用冷房電気消費量に関する研究" 空気調和・衛生工学会九州支部研究報告. 第2号. 1-6 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 進藤博,渡辺俊行,他: "夏季蒸暑地域における戸建住宅の構法別および部位別気密性能調査" 日本建築学会中国・九州支部合同研究報告. 第10号. 293-296 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A. Ozaki, T. Watanabe, et al.: "Study on Prevention of Moisture Injury of Exterior Walls in the Hot-Humid Season" Proc. of the 2nd Int. Conf. on IAQ,Ventilation and Energy Consevation in Buildings. 575-582 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 渡辺康徳,渡辺俊行,他: "地域性を考慮した住宅の断熱気密効果 その1,2" 日本建築学会大会学術講演梗概集. 175-178 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 佐藤章造,渡辺俊行,他: "断熱壁体の内部結露とその防止に関する研究 その2" 日本建築学会大会学術講演梗概集. 339-340 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 蔵重裕行,渡辺俊行,他: "通気壁体の温湿度変動と防露効果に関する研究 その3" 日本建築学会中国・九州支部合同研究報告. 第10号. 345-348 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 渡辺俊行: "温暖地における住宅のアメニティとエネルギー" 熱と環境. 43. 1-10 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 渡辺俊行,他: "水分ポテンシャルによる壁体湿気移動解析(その5,6,7)" 日本建築学会大会学術講演梗概集. 257-262 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Itsunari Fukushima, Toshiyuki Watanabe, et al.: "Study on Life-Style and Housing Energy Consumption for Air-Conditioning during Summer Season in Fukuoka" Technical Papers of SHASE Kyushu Branch.NO.2, (in Japanese). 1-6 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi Sinto, Toshiyuki Watanabe, et al.: "Air Tightness of Detached Houses in Seasonal Hot-Humid Area accordingto Building Construction and Buildind Element" Technical Papers of AIJ Chugoku and Kyushu Branch. No.10, (in Japanese). 293-296 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ozaki, T.Watanabe, et al.: "Study on Prevention of Moisture Injury of Exterior Walls in the Hot-Humid Season" Proc.of the 2nd Int.Conf.on IAQ,Ventilation and Energy Consevation in Buildings. 575-582 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yasunori Watanabe, Toshiyuki Watanabe, at al.: "Effects of Thermal Insurated and Air-Tight House Considering Different Locatities, Part1,2" Summeries of Technical Papers of AIJ Annual Meeting. D-2, (in Japanese). 175-178 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shozo Sato, Toshiyuki Watanabe, et al.: "Study on Internal Dew Condensation and Its Prevention of Outside Insurated Wall, Part 2" Summeries of Technical Papers of AIJ Annual Meeting. D-2, (in Japanese). 339-340 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroyuki Kurashige, Toshiyuki Watanabe, et al.: "Study on Prevention Effect of Dew Condensation and Fluctuation of Temperature-Humidity of Vent System Wall, Part 3" Technical Papers of AIJ Chugoku and Kyushu Branch. No.10(in Japanese). 345-348 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1997-03-04  

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